Abstract
Owing to the high mineralization and high treatment cost, Ordovician limestone water is often regarded as a mine wastewater. In order to make rational use of mine water with high mineralization and turn waste into treasure. In this work, the natural water quality of Ordovician mine water in the Weibei coalfield had been tested, and the suspended matter and trace elements of Ordovician mine water in the selected deep detained area had been further tested. As a contrast, the water quality of Ordovician mine water after heating and concentration had been tested. The mechanical and hydraulic parameters of concentrated mine water-loess and concentrated mine water-cement slurry had been tested and compared with conventional slurry. The results showed characteristics of deep detained Ordovician limestone mine water is high salinity, certain suspended matters, limited special material and high permanent hardness. However, compressive strength of loess samples increased, while the permeability reduced. The initial setting-time of the modified material was short, while it showed an increased compressive strength. In practical terms, the quantity of grouting produced in engineering applications can be reduced by 16%, whereas the discharge of high-mineralized mine water can be decreased by about 40,000 m3/a.
Highlights
Coal resource in China is mainly distributed in six regions, including North China, South China, Northeast China, Northwest China, Tibet and Taiwan, while the Coal mining in North China is seriously threatened by water damage from coal floor (Li & Chen 2015, Shi & Singh 2001, Wu et al 2011)
Hydrological and mechanical properties as well as the mechanisms of loess and cement grouting materials modified by concentrated Ordovician limestone mine water from deep detained reservoir were studied using suitable experiments
1) There is a kind of mine water, which is characterized by high mineralization, varying from 2379.0 to 4614.2 mg/L, certain amount of suspended matter of 121 mg/L, limited amounts of special materials and high permanent hardness
Summary
Coal resource in China is mainly distributed in six regions, including North China, South China, Northeast China, Northwest China, Tibet and Taiwan, while the Coal mining in North China is seriously threatened by water damage from coal floor (Li & Chen 2015, Shi & Singh 2001, Wu et al 2011). The water inrush coefficient (Ts), defined as the water pressure that can be sustained by the unit aquiclude thickness of the coal seam floor, was first put forward at the Jiaozuo Mine Water Control Conference in 1964 (Liu 2009). This method has been perfected many times. It is considered that the water inrush from the floor mainly depends on two factors, the effective thickness of the intermediate strata (between the coal seam and the Ordovician limestone confined aquifer) (Qiao et al 2009, Yao et al 2012) and the pressure of the Ordovician aquifer on the intermediate strata
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
